JPWO2018029848A1 - Registration error detection device, registration error detection method, and printed matter - Google Patents

Abstract

In the registration error detection apparatus, the imaging unit includes two first registration marks 202 and 204 of the first color printed on the substrate 30 by the first plate cylinder of the rotary printing press, and the second registration mark of the rotary printing press. The second register mark 210 of the second color printed on the printing material 30 is imaged by the plate cylinder. The calculation unit calculates a registration error based on the number of pixels between the reference position between the two first registration marks 202 and 204 and the comparison position based on the second registration mark 210 in the image captured by the imaging unit. To do.

Description

  The present invention relates to a registration error detection device that detects a registration error based on a registration mark, a registration error detection method, and a printed matter on which the registration mark is printed.

  When printing a multicolor pattern on a web by a rotary printing machine, generally one color is overlaid and printed to form one pattern. In this case, since printing may be shifted when the colors overlap, it is necessary to perform correct alignment so as not to cause misregistration. In order to achieve this object, an automatic control device called an automatic registration device is used. The automatic registration device generally includes a registration error detection device that detects a registration error based on a registration mark printed for each color on a web, and a compensator roller or a plate of a rotary printing press so that the registration error is corrected. Control the torso. The register mark is also referred to as a register mark.

  The registration error detection device includes, for example, two line sensors provided with a reference interval in the web conveyance direction, and a deviation amount of the interval between the two color registration marks detected by the line sensor from the reference interval. Is a registration error (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 08-267727

  After printing, the area of the web where the register mark is printed is cut. Therefore, it is preferable to reduce the registration mark in order to eliminate waste. However, it is difficult to reduce the registration mark without reducing the registration error detection accuracy.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a technique capable of reducing a registration mark while suppressing a decrease in detection accuracy of registration error.

  In order to solve the above-described problem, a registration error detection device according to an aspect of the present invention includes two first registration marks of a first color printed on a substrate by a first plate cylinder of a rotary printing press, An imaging unit that captures a second color second registration mark printed on a substrate by a second plate cylinder of a printing press, and a reference between the two first registration marks in an image captured by the imaging unit A calculation unit that compares the position with a comparison position based on the second registration mark.

  Another aspect of the present invention is a registration error detection method. In this method, two first registration marks of a first color printed on a printing material by a first plate cylinder of a rotary printing press and a first printing mark printed on the printing material by a second printing drum of a rotary printing press. A second registration mark of two colors is imaged, and a reference position between the two first registration marks in the captured image is compared with a comparison position based on the second registration mark.

  Yet another embodiment of the present invention is a printed material. This printed matter is a printed matter on which a register mark for controlling a printing misalignment of a rotary printing press is printed. The printed matter and two first printed on the printed matter by the first plate cylinder of the rotary printing press. A first color registration mark of one color, and a second color registration mark of a second color printed on a substrate by a second plate cylinder of a rotary printing press.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  According to the present invention, it is possible to reduce the registration mark while suppressing a decrease in registration error detection accuracy.

It is a figure which shows the rotary printing machine provided with the registration error detection apparatus which concerns on 1st Embodiment. It is a figure which shows a part of printed matter with which the registration mark which concerns on 1st Embodiment was printed. It is a figure which shows the image of the registration mark imaged by the imaging part of FIG. It is a figure which shows the image of the registration mark when the imaging part of FIG. 1 rotates in the surface direction of a web. It is a figure which shows the image of the other registration mark at the time of the imaging part of FIG. 1 rotating in the in-plane direction of the web. It is a figure which shows a part of printed matter with which the registration mark which concerns on 2nd Embodiment was printed. It is a figure which shows the image of the registration mark imaged with the imaging part which concerns on 2nd Embodiment. It is a figure which shows the other image of the registration mark imaged with the imaging part which concerns on 2nd Embodiment.

(First embodiment)
FIG. 1 is a diagram illustrating a rotary printing press 1 including a registration error detection device 100 according to the first embodiment. A rotary printing press 1 shown in FIG. 1 is a multicolor gravure rotary printing press capable of four-color printing on a web 30 such as a film as a substrate.

  As shown in FIG. 1, the rotary printing press 1 includes a first printing unit 12a, a second printing unit 12b, a third printing unit 12c, a fourth printing unit 12d, an unwinding unit 14, and a winding unit. 16, a plurality of compensator rollers 32, a plurality of register motors 34, a monitor 40, and a registration error detection device 100.

  The four first printing units 12a, the second printing unit 12b, the third printing unit 12c, and the fourth printing unit 12d are arranged in series. Note that the first printing unit 12a, the second printing unit 12b, the third printing unit 12c, and the fourth printing unit 12d are collectively referred to as “printing unit 12” as appropriate.

  An unwinding unit 14 for supplying the web 30 to be printed is installed upstream of the first printing unit 12a. Further, a winding unit 16 for winding the printed web 30 is installed downstream of the fourth printing unit 12d. Each printing unit 12 is provided with a plurality of guide rollers 18 to form a conveyance path for the web 30.

  Each printing unit 12 has a cylindrical plate cylinder 20 for transferring ink as a coating agent on the lower side of the web 30 and a cylindrical impression cylinder 22 for applying pressure to the web 30 on the upper side. , Each of which is rotatably mounted around a cylindrical axis. Further, a dryer 24 for drying the printing surface of the web 30 is disposed downstream of each plate cylinder 20.

  The registration error detection device 100 includes three imaging units 26 and a control device 28. The control device 28 includes a calculation unit 28a and a control unit 28b. An imaging unit 26 is disposed between the plate cylinder 20 and the dryer 24 in each of the second printing unit 12b, the third printing unit 12c, and the fourth printing unit 12d. The imaging unit 26 is configured using, for example, a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) that receives light and converts it into an electrical signal.

  For example, the imaging unit 26 of the second printing unit 12b images the first registration mark printed by the first printing unit 12a upstream of itself and the second registration mark printed by its own plate cylinder 20. The first registration mark and the second registration mark are marks for controlling printing misalignment of the rotary printing press 1. The imaging unit 26 is electrically connected to the control device 28. The calculation unit 28a of the control device 28 calculates a registration error between the first registration mark and the second registration mark based on the image captured by the imaging unit 26. The calculation unit 28a calculates a vertical registration error that is a registration deviation in the conveyance direction of the web 30 and a horizontal registration error that is a registration deviation in a direction (referred to as a horizontal direction) orthogonal to the conveyance direction in the plane of the web 30. It can be calculated.

  Similarly, each of the imaging units 26 of the third printing unit 12c and the fourth printing unit 12d also has the first registration mark printed by the printing unit 12 upstream of itself and the first registration mark printed by its own plate cylinder 20. 2. Image the register mark. The calculation unit 28a also calculates a registration error between the first registration mark and the second registration mark based on the image captured by the imaging unit 26 for each of the third printing unit 12c and the fourth printing unit 12d. Details of the calculation of the registration error will be described later.

  The supply phase of the web 30 is between the first printing unit 12a and the second printing unit 12b, between the second printing unit 12b and the third printing unit 12c, and between the third printing unit 12c and the fourth printing unit 12d. A compensator roller 32 for adjusting the above is disposed. The compensator roller 32 is driven by a register motor 34. Each register motor 34 is electrically connected to the control device 28, and moves the compensator roller 32 up and down by an instruction from the control unit 28 b of the control device 28 so that the vertical registration error is eliminated. Thereby, the printing misalignment in the vertical direction can be corrected in each printing unit 12.

  Further, the plate cylinders 20 of the second printing unit 12b, the third printing unit 12c, and the fourth printing unit 12d are arranged in such a way that there is no lateral registration error in accordance with an instruction from the control unit 28b of the control device 28. Move in the direction. As a result, it is possible to correct lateral printing misalignment in each printing unit 12.

  The monitor 40 is connected to the control device 28 and displays an image captured by the imaging unit 26 and the like. The user can visually recognize the misregistration situation by monitoring the monitor 40.

  The control device 28 includes a computer, and various functions of the control device 28 can be configured by hardware in circuit blocks, memories, and other LSIs, and in software, by programs loaded in the memory, etc. Realized. Therefore, it is understood by those skilled in the art that various functions of the control device 28 can be realized in various forms by hardware only, software only, or a combination thereof, and is not limited to any one.

  FIG. 2 is a diagram illustrating a part of the printed material 300 on which the registration mark 200 according to the first embodiment is printed. The printed material 300 includes a web 30, two first color first registration marks 202 and 204, and a second color second registration mark 210 different from the first color. The first registration marks 202 and 204 and the second registration mark 210 are collectively referred to as a registration mark 200. Although illustration is omitted, a pattern of the first color and a pattern of the second color are printed outside the area where the register mark 200 of the web 30 is printed.

  The two first registration marks 202 and 204 are printed on the web 30 by the plate cylinder (first plate cylinder) 20 of the first printing unit 12 a of the rotary printing press 1. The second registration mark 210 is printed on the web 30 by the plate cylinder (second plate cylinder) 20 of the second printing unit 12 b of the rotary printing press 1.

  Since the two first registration marks 202 and 204 are printed by the same plate cylinder 20, the distance Dis1 between the centroids of the two first registration marks 202 and 204 is substantially independent of the registration deviation. Is constant.

  The two first registration marks 202 and 204 and the second registration mark 210 are each circular. The area of each of the two first registration marks 202 and 204 is substantially ½ of the area of the second registration mark 210.

  The two first registration marks 202 and 204 and the second registration mark 210 are arranged along the conveyance direction dt of the web 30 in the rotary printing press 1. The second registration mark 210 is disposed between the two first registration marks 202 and 204.

  When there is no printing misalignment, the first registration mark 202, 204 and the second registration mark 210 are arranged so that the center of gravity of the second registration mark 210 coincides with the center of gravity of the two first registration marks 202, 204. Yes. When there is a printing misalignment, the center of gravity of the second register mark 210 does not coincide with the center of gravity of the two first register marks 202 and 204. Here, the center of gravity of the two first registration marks 202 and 204 represents the midpoint between the center of gravity of one first registration mark 202 and the center of gravity of the other first registration mark 204.

  FIG. 3 is a diagram illustrating an image of the registration mark 200 captured by the imaging unit 26 of FIG. The calculation unit 28a of the registration error detection apparatus 100 performs a comparison based on the reference position P1 between the two first registration marks 202 and 204 in the image captured by the imaging unit 26 and the second registration mark 210 shown in FIG. The position P2 is compared, and a registration error is calculated based on the number of pixels between the reference position P1 and the comparison position P2. In the present embodiment, the calculation unit 28a uses the center of gravity of the two first registration marks 202 and 204 obtained by known image processing as the reference position P1, and uses the center of gravity of the second registration mark 210 obtained by known image processing. The comparison position is P2. During image processing, it is possible to easily specify the second registration mark 210 having an area different from that of the first registration marks 202 and 204.

  The calculation method of the reference position P1 that is the center of gravity of the two first registration marks 202 and 204 is not particularly limited. For example, the computing unit 28a may obtain the center of gravity of the first register mark 202 by known image processing, obtain the center of gravity of the first register mark 204, and obtain the midpoint of these centers of gravity as the reference position P1. Alternatively, the calculation unit 28a can directly calculate the reference position P1 based on the areas of the two first registration marks 202 and 204 by known image processing. Since the area of each of the two first registration marks 202 and 204 is substantially ½ of the area of the second registration mark 210, the number of samplings of the two first registration marks 202 and 204 in the image ( That is, the sum of the number of pixels) and the sampling number of the second register mark 210 are substantially equal. Therefore, the number of samplings used when directly calculating the center of gravity using the two first registration marks 202 and 204 is substantially equal to the number of samplings used when calculating the center of gravity of the second registration mark 210. . Therefore, such calculation can suppress an error in calculation of the center of gravity.

  The calculation unit 28a calculates the number of pixels between the centroids of the two first registration marks 202 and 204 in the image and the known distance Dis1 between the centroids of the two printed first registration marks 202 and 204. Based on the above, the distance per pixel is calculated. For example, when the known distance Dis1 is 10 mm and the number of pixels is 100 pixels, the distance per pixel is 0.1 mm / pixel. The calculation of the distance per pixel may be performed every time a new image of the first registration marks 202 and 204 is captured, or may be performed every predetermined period.

  Then, the calculation unit 28a calculates the product of the calculated distance per pixel and the number of pixels between the reference position P1 and the comparison position P2 as a registration error. Specifically, the calculation unit 28a calculates a registration error in a direction d1 of a straight line passing through the two first registration marks 202 and 204 in the image and a direction d2 orthogonal to the straight line. The direction d1 is equal to the transport direction dt. The calculation unit 28a calculates the product of the distance per pixel and the number of pixels between the reference position P1 and the comparison position P2 in the direction d1 as a vertical registration error. The calculation unit 28a calculates the product of the distance per pixel and the number of pixels between the reference position P1 and the comparison position P2 in the direction d2 as a lateral registration error.

  The control unit 28b adjusts the conveyance of the web 30 in the conveyance direction dt according to the obtained vertical registration error, adjusts the conveyance of the web 30 in the horizontal direction according to the obtained horizontal registration error, and print misalignment. To correct. Imaging, calculation of registration error, and correction of printing misalignment as described above are performed every time the second registration mark 210 is printed between the two first registration marks 202 and 204, and real-time is performed during printing. The print misalignment is corrected.

  In the above calculation of the registration error, the number of pixels between the reference position P1 and the comparison position P2 of the image changes according to the distance between the imaging unit 26 and the registration mark 200, but the two first registrations of the image. Since the number of pixels between the centroids of the marks 202 and 204 also changes, the distance per pixel also changes with the same tendency. Therefore, the registration error can be calculated with high accuracy regardless of the distance between the imaging unit 26 and the registration mark 200.

  When printing another type of printed matter after printing a certain type of printed matter, the user replaces the plate cylinder 20, but the new plate cylinder 20 is different in width and circumference from those before the replacement. There are many cases. In that case, it is necessary to adjust the position of the imaging unit 26 in accordance with the new plate cylinder 20, but in this embodiment, the registration error can be detected with high accuracy regardless of the distance between the imaging unit 26 and the registration mark 200. The position of the imaging unit 26 can be easily adjusted. That is, it is not necessary to accurately match the distance between the imaging unit 26 and the registration mark 200 to a certain distance. Therefore, printing of other types of printed matter can be started in a short time. As a result, the printing time for a plurality of types of printed matter can be shortened.

  FIG. 4 is a diagram illustrating an image of the register mark 200 when the imaging unit 26 of FIG. 1 rotates in the in-plane direction of the web 30. When the user adjusts the position of the imaging unit 26, the imaging unit 26 may rotate in the in-plane direction of the web 30. In that case, the captured image also rotates as shown in FIG. Here, as described above, the calculation unit 28a calculates a registration error in the direction d1, that is, the transport direction dt and the direction d2. Therefore, even if the imaging unit 26 rotates in the in-plane direction of the web 30, the vertical registration error in the transport direction dt and the horizontal lateral registration error orthogonal to the transport direction dt are not affected by the rotation. Can be calculated. Therefore, it is not necessary to adjust the rotation angle of the imaging unit 26 in the in-plane direction of the web 30 to exactly 0 °. This also makes it easy to adjust the position of the imaging unit 26.

  FIG. 5 is a diagram illustrating an image of another registration mark 200 </ b> X when the imaging unit 26 of FIG. 1 rotates in the in-plane direction of the web 30. The shape of each registration mark may be a quadrangle as shown in FIG. However, in the case of a quadrilateral, the relationship between the direction of the quadrangular sides and the arrangement direction of the pixels of the image changes according to the rotation of the imaging unit 26 in the in-plane direction of the web 30, so that the end of each registration mark An error may occur in That is, the sampling number of each registration mark in the image may vary between when the imaging unit 26 rotates in the in-plane direction of the web 30 and when the imaging unit 26 does not rotate in the in-plane direction of the web 30. . Therefore, an error may occur in the coordinates of the center of gravity.

  On the other hand, in the example of FIGS. 2 to 4, the first register marks 202 and 204 and the second register mark 210 are each circular. For this reason, the number of samplings of the first register mark 202, 204 and the second register mark 210 in the image is unlikely to vary between when the imaging unit 26 rotates in the in-plane direction of the web 30 and when it does not rotate. . Therefore, the error of the center of gravity can be suppressed. That is, the shape of the first register marks 202, 204, etc. is preferably circular.

  Note that the two first register marks 202 and 204 printed by the plate cylinder 20 of the second printing unit 12b and the second register mark 210 printed by the plate cylinder 20 of the third printing unit 12c are also third. Using the image picked up by the image pickup unit 26 arranged in the printing unit 12c, the registration error can be calculated as described above. The second first registration marks 202 and 204 printed by the plate cylinder 20 of the third printing unit 12c and the second registration marks 210 printed by the plate cylinder 20 of the fourth printing unit 12d are also the fourth. Using the image picked up by the image pickup unit 26 arranged in the printing unit 12d, the registration error can be calculated in the same manner as described above.

  As described above, according to the present embodiment, the distance per pixel is obtained using images obtained by imaging the two first color registration marks 202 and 204 of the first color and the second color registration mark 210 of the second color. The product of the pixel number between the reference position P1 and the comparison position P2 of the image is calculated as a registration error. Thereby, even if the distance between the imaging unit 26 and the registration mark 200 changes, the registration error can be calculated with high accuracy.

  Further, since the center of gravity of the two first registration marks 202 and 204 is set as the reference position P1, the reference position P1 can be determined with high accuracy.

  In addition, since the registration mark 200 is imaged by the imaging unit 26, the registration mark 200 can be reduced by using the high-resolution imaging unit 26.

  Therefore, the registration mark 200 can be made small while suppressing a decrease in registration error detection accuracy.

  Furthermore, the registration mark 200 can be reduced, and the two first registration marks 202 and 204 and the second registration mark 210 are arranged in a line along the transport direction dt, so that the registration mark 200 is printed. The width of the area can be reduced. After printing, the area where the registration mark 200 of the web 30 is printed is cut, so that waste can be eliminated.

(Second Embodiment)
The second embodiment is different from the first embodiment in that an additional second registration mark is further provided. Below, it demonstrates centering around difference with 1st Embodiment.

  FIG. 6 is a diagram illustrating a part of a printed material 300A on which a registration mark 200A according to the second embodiment is printed. As shown in FIG. 6, an additional second registration mark 212 of the second color is further printed on the web 30. The additional second registration mark 212 is printed on the web 30 by the plate cylinder (second plate cylinder) 20 of the second printing unit 12 b of the rotary printing press 1, similarly to the second registration mark 210. The additional second registration mark 212 is also circular. The areas of the two first registration marks 202, 204, the second registration mark 210, and the additional second registration mark 212 are substantially equal.

  The first line segment L1 connecting the centroids of the two first registration marks 202 and 204 is orthogonal to the second line segment L2 linking the centroid of the second registration mark 210 and the centroid of the additional second registration mark 212. doing. The 1st line segment L1 and the 2nd line segment L2 should just cross | intersect, and do not need to be orthogonally crossed.

  When there is no printing misalignment, the first registration marks 202 and 204 are arranged so that the centroids of the second registration mark 210 and the additional second registration mark 212 coincide with the centroids of the two first registration marks 202 and 204. A second registration mark 210 and an additional second registration mark 212 are arranged. When there is a printing misalignment, the centroids of the second registration mark 210 and the additional second registration mark 212 do not coincide with the centroids of the two first registration marks 202 and 204. Here, the center of gravity of the second register mark 210 and the additional second register mark 212 is the midpoint between the center of gravity of the second register mark 210 and the center of gravity of the additional second register mark 212.

  The imaging unit 26 further images an additional second registration mark 212 in addition to the two first registration marks 202 and 204 and the second registration mark 210.

  FIG. 7 is a diagram illustrating an image of the register mark 200A captured by the imaging unit 26 according to the second embodiment. The calculation unit 28a sets the center of gravity of the second registration mark 210 and the additional second registration mark 212 in the image illustrated in FIG. 7 as the comparison position P2.

  When the angle θ formed by the first line segment L1 and the second line segment L2 in the image is within a predetermined angle range, the calculation unit 28a is similar to the distance per pixel as in the first embodiment. And the product of the number of pixels between the reference position P1 and the comparison position P2 is calculated as a registration error. Then, the calculation unit 28a instructs the control unit 28b to control printing misalignment of the rotary printing press 1. The angle range is, for example, a range from (90−α) ° to (90 + α) °, where α is a constant, and the optimum value can be appropriately determined by experiments or the like.

  FIG. 8 is a diagram illustrating another image of the registration mark 200A captured by the imaging unit 26 according to the second embodiment. In FIG. 8, the first line segment L1 is inclined with respect to the transport direction dt. Such a situation can occur, for example, when the web 30 moves laterally between the time when the first register mark 202 is printed and the time when the first register mark 204 is printed.

  The calculation unit 28a differs from the case where the angle θ is within the predetermined angle range when the angle θ formed by the first line segment L1 and the second line segment L2 is outside the angle range in the image. Perform the action. For example, when the angle θ is out of the angle range, the calculation unit 28a instructs the control unit 28b to prohibit printing deviation control of the rotary printing press 1.

  As described above, according to the present embodiment, control of printing misalignment based on the registration mark 200A having an arrangement different from normal is prohibited, and thus control of misprinting that may be erroneous can be suppressed. Accordingly, it is possible to improve the accuracy of printing misalignment control.

  The present invention has been described based on the embodiments. The embodiments are exemplifications, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements and processing processes, and such modifications are within the scope of the present invention. .

  For example, in the above-described embodiment, an example in which the registration error detection device 100 is applied to the rotary printing press 1 for gravure printing has been described, but the present invention is not limited thereto. For example, the registration error detection device 100 can be applied to a rotary printing press for offset printing. Moreover, the rotary printing machine 1 should just be a multicolor rotary printing machine, and is not limited to 4 color printing.

  Further, the case where the two first registration marks 202 and 204 are printed by the plate cylinder 20 of the first printing unit 12a and the second registration mark 210 is printed by the plate cylinder 20 of the third printing unit 12c. The registration error can be calculated in the same way as. Further, the case where the two first registration marks 202 and 204 are printed by the plate cylinder 20 of the first printing unit 12a and the second registration mark 210 is printed by the plate cylinder 20 of the fourth printing unit 12d. The registration error can be calculated in the same way as. In this modification, the printing misalignment can be corrected in each printing unit 12 based on the registration error calculated based on the first registration marks 202 and 204 printed by the plate cylinder 20 of the same first printing unit 12a. Therefore, it is possible to improve the accuracy of correcting printing misalignment. In this modification, for example, in the case of four-color printing, it is necessary to print three sets of two first registration marks 202 and 204 in a line by the plate cylinder 20 of the first printing unit 12a. In this regard, in the above embodiment, since the small first registration marks 202 and 204 can be used, even the plate cylinder 20 having a relatively short circumference can be easily dealt with.

  In addition, when the areas of the two first registration marks 202 and 204 are different from each other in the captured image, the calculation unit 28a may correct the registration error based on the areas. When the imaging unit 26 is inclined in the transport direction dt with respect to the surface of the web 30, the areas of the two first registration marks 202 and 204 in the image are different from each other. In this case, since the centroids of the two calculated first registration marks 202 and 204 include an error, the registration error is not accurate. In this modification, a more accurate registration error can be obtained in consideration of the influence of the inclination of the imaging unit 26.

DESCRIPTION OF SYMBOLS 1 ... Rotary press, 20 ... Plate cylinder, 26 ... Imaging part, 28a ... Calculation part, 30 ... Web, 100 ... Registration error detection apparatus, 202,204 ... 1st registration mark, 210 ... 2nd registration mark, 212 ... Additional second registration mark, 300, 300A ... printed matter.

  The present invention can be used in a rotary printing press.

Claims (12)

Two first registration marks of the first color printed on the substrate by the first plate cylinder of the rotary printing press, and the second color printed on the substrate by the second plate cylinder of the rotary printing press. An imaging unit for imaging the second registration mark of
A calculation unit that compares a reference position between the two first registration marks in the image captured by the imaging unit with a comparison position based on the second registration mark;
A registration error detecting device comprising:   The registration error detection apparatus according to claim 1, wherein the calculation unit calculates a registration error based on a number of pixels between the reference position and the comparison position.   The arithmetic unit is based on the number of pixels between the centroids of the two first registration marks in the image and a known distance between the centroids of the two printed first registration marks. The distance per pixel is calculated, and the product of the distance per pixel and the number of pixels between the reference position and the comparison position is calculated as the registration error. The registration error detection device described. The two first registration marks and the second registration mark are arranged along a conveyance direction of the substrate in the rotary printing press,
The second register mark is disposed between the two first register marks,
4. The registration error detection apparatus according to claim 2, wherein the calculation unit sets a center of gravity of the second registration mark as the comparison position. 5.   5. The registration according to claim 4, wherein the calculation unit calculates the registration error in a direction of a straight line passing through the two first registration marks in the image and a direction orthogonal to the straight line. Error detection device.   6. The registration error detection according to claim 1, wherein an area of each of the two first registration marks is substantially ½ of an area of the second registration mark. apparatus.   The registration error detection device according to claim 1, wherein each of the two first registration marks and the second registration mark is circular. The imaging unit further images an additional second registration mark of the second color printed on the substrate by the second plate cylinder,
A first line connecting the two first register marks intersects a second line connecting the second register mark and the additional second register mark;
4. The registration error detection apparatus according to claim 1, wherein the calculation unit sets a center of gravity of the second registration mark and the additional second registration mark as the comparison position. 5.   The operation unit prohibits printing misregistration control of the rotary printing press when an angle formed by the first line segment and the second line segment is outside a predetermined angle range in the image; The registration error detection device according to claim 8. Two first registration marks of the first color printed on the substrate by the first plate cylinder of the rotary printing press, and the second color printed on the substrate by the second plate cylinder of the rotary printing press. The second registration mark of
A registration error detection method comprising: comparing a reference position between the two first registration marks in a captured image with a comparison position based on the second registration mark. A printed matter on which a register mark for controlling printing misalignment of a rotary printing press is printed,
The substrate,
Two first color registration marks printed on the substrate by the first printing cylinder of the rotary printing press;
A second registration mark of a second color printed on the substrate by a second plate cylinder of the rotary printing press;
A printed matter comprising: The two first registration marks and the second registration mark are arranged along a conveyance direction of the substrate in the rotary printing press,
The printed matter according to claim 11, wherein the second register mark is arranged between the two first register marks.

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